In a world where games decide everything - even national borders - a genius brother-sister duo aim to put their gamesmanship to the test to save humanity! In the world of Disboard, everything is decided by games. And after rising to reign as the monarchs of the remnants of Disboard's humans, gamer siblings Sora and Shiro have now wagered the fate of every human being alive on the outcome of a game against the Eastern Union! But immediately after making this wager, Sora disappears, leaving only a cryptic message behind. 'Blank,' the legendary two-in-one gamer, has been torn asunder! What is Sora thinking? What will Shiro do? What will become of humanity? And what about the paradise of animal-girls?